/**
* Handles JMX registration (if required) and the initialization required for monitoring.
*
* @param config Pool configuration
* @param jmxNameBase The default base JMX name for the new pool unless overridden by the config
* @param jmxNamePrefix Prefix to be used for JMX name for the new pool
*/
public BaseGenericObjectPool(
BaseObjectPoolConfig config, String jmxNameBase, String jmxNamePrefix) {
if (config.getJmxEnabled()) {
this.oname = jmxRegister(config, jmxNameBase, jmxNamePrefix);
} else {
this.oname = null;
}
// Populate the creation stack trace
this.creationStackTrace = getStackTrace(new Exception());
// save the current TCCL (if any) to be used later by the evictor Thread
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
factoryClassLoader = null;
} else {
factoryClassLoader = new WeakReference<>(cl);
}
fairness = config.getFairness();
}
/**
* Registers the pool with the platform MBean server. The registered name will be <code>
* jmxNameBase + jmxNamePrefix + i</code> where i is the least integer greater than or equal to 1
* such that the name is not already registered. Swallows MBeanRegistrationException,
* NotCompliantMBeanException returning null.
*
* @param config Pool configuration
* @param jmxNameBase default base JMX name for this pool
* @param jmxNamePrefix name prefix
* @return registered ObjectName, null if registration fails
*/
private ObjectName jmxRegister(
BaseObjectPoolConfig config, String jmxNameBase, String jmxNamePrefix) {
ObjectName objectName = null;
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
int i = 1;
boolean registered = false;
String base = config.getJmxNameBase();
if (base == null) {
base = jmxNameBase;
}
while (!registered) {
try {
ObjectName objName;
// Skip the numeric suffix for the first pool in case there is
// only one so the names are cleaner.
if (i == 1) {
objName = new ObjectName(base + jmxNamePrefix);
} else {
objName = new ObjectName(base + jmxNamePrefix + i);
}
mbs.registerMBean(this, objName);
objectName = objName;
registered = true;
} catch (MalformedObjectNameException e) {
if (BaseObjectPoolConfig.DEFAULT_JMX_NAME_PREFIX.equals(jmxNamePrefix)
&& jmxNameBase.equals(base)) {
// Shouldn't happen. Skip registration if it does.
registered = true;
} else {
// Must be an invalid name. Use the defaults instead.
jmxNamePrefix = BaseObjectPoolConfig.DEFAULT_JMX_NAME_PREFIX;
base = jmxNameBase;
}
} catch (InstanceAlreadyExistsException e) {
// Increment the index and try again
i++;
} catch (MBeanRegistrationException e) {
// Shouldn't happen. Skip registration if it does.
registered = true;
} catch (NotCompliantMBeanException e) {
// Shouldn't happen. Skip registration if it does.
registered = true;
}
}
return objectName;
}
